<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Flask模版中使用url_for-登录</title>
</head>
<body>
    <div>
        <h3>登录</h3>
        <form action="" method="post">
            <input name="username" type="text">
            <input name="password" type="password">
            <button type="submit">登录</button>
        </form>
    </div>
</body>
</html>